WO1994010749A1 - Integrated emi/rfi filter magnetics - Google Patents
Integrated emi/rfi filter magnetics Download PDFInfo
- Publication number
- WO1994010749A1 WO1994010749A1 PCT/US1993/009722 US9309722W WO9410749A1 WO 1994010749 A1 WO1994010749 A1 WO 1994010749A1 US 9309722 W US9309722 W US 9309722W WO 9410749 A1 WO9410749 A1 WO 9410749A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- core
- winding
- inductor
- common mode
- magnetic
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F10/00—Thin magnetic films, e.g. of one-domain structure
- H01F10/32—Spin-exchange-coupled multilayers, e.g. nanostructured superlattices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y25/00—Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/02—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements
- G11C11/14—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements using thin-film elements
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/21—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements
- G11C11/22—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using ferroelectric elements
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/56—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using storage elements with more than two stable states represented by steps, e.g. of voltage, current, phase, frequency
- G11C11/5607—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using storage elements with more than two stable states represented by steps, e.g. of voltage, current, phase, frequency using magnetic storage elements
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/56—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using storage elements with more than two stable states represented by steps, e.g. of voltage, current, phase, frequency
- G11C11/565—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using storage elements with more than two stable states represented by steps, e.g. of voltage, current, phase, frequency using capacitive charge storage elements
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
- H03H1/0007—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network of radio frequency interference filters
Definitions
- EMI radio frequency interference
- RFID radio frequency interference
- the noise can interfere with the operation of televisions, radios, telephones and similar equipment.
- the electrical noise can conduct through the power lines or radiate through power line or through output leads.
- An electronic ballast or any other electronic circuit for powering fluorescent lights is affected by EMI/RFI noise and also produce EMI/RFI noise.
- a filter is therefore needed to reduce the EMI/RFI noise produced by the ballasts and to filter the EMI/RFI noise from the lines powering the ballasts.
- a filter for an electronic ballast should filter any power line transients, as well as decrease THD (total harmonic distortion).
- EMI/RFI noise There are two types of EMI/RFI noise. Differential noise is interference generated between the power line and the return line. Common mode noise is interference between both the power line and the return line and ground.
- an inductor is placed in series in the power line to eliminate differential noise. Elimination of common mode noise is done by way of two inductors wound on the same core. One of the two inductors is in series with the power line and the second inductor in series with the return line.
- a magnetic for an EMI/RFI filter comprises a common mode inductor wound around a core, the inductor having a substantially closed magnetic path for the common mode inductor.
- a differential inductor is wound around the core and the inductor having a substantially closed magnetic path for the differential mode inductor.
- a method of constructing the magnetic for an EMI/RFI filter uses the steps of providing an E-core with a first outer leg, a center leg, and a second outer leg, each leg having an end surface, placing a second core proximal to and spaced from the end surfaces of the E-core legs, placing a first winding about the first outer leg of the E-core, the first winding having a first number of turns, placing a second winding about the second outer leg of the E-core, the second winding having a second number of turns.
- the spacing between the end surface of each E-core leg and the second core, the number of turns of the first winding, and the number of turns of the second winding is adjusted to attain the desired common mode inductance and the desired differential inductance.
- Figure 1 is a schematic diagram of an RFI/EMI filter.
- Figure 2 is an integrated magnetic for inductors in an RFI/EMI filter.
- Figure 1 shows a circuit for a RFI/EMI filter.
- Terminals 100, 102 receive AC powered at 60 Hz.
- Differential inductor 104 is in series with terminal 100 on the power line.
- Differential inductor 106 is in series with terminal 102 on the return line.
- Common mode inductors 108, 110 are wound on core 109.
- Common mode inductor 108 is in series with differential inductor 104 while common mode inductor 1 10 is in series with differential inductor 106.
- Terminals 1 12, 114 are coupled to an additional circuit, such as a boost converter and inverter for an electronic ballast.
- Capacitor 116 couples terminal 112 to ground and capacitor 118 couples terminal 114 to ground.
- Differential inductors 104, 106 provide RFI/EMI filtering for differential noise, while common mode inductors 108, 110 in conjunction with capacitors 116, 1 18 provide RFI/EMI filtering for common mode noise.
- Figure 2 shows integrated magnetic 200 for differential inductors 102, 104 and common mode inductors 108, 1 10.
- Integrated magnetic 200 has a two-part core.
- E-core E-core
- first outer leg 204 has upper portion 201 , first outer leg 204, second outer leg 206 and center leg 208.
- Legs 204, 206, 208 may be slightly spaced from a second core, I-core 210.
- Winding 212 is positioned on I-core 210 between outer leg 204 and center leg 208
- winding 214 is positioned on I-core 210 between outer leg 206 and center leg 208. Windings 212, 214 could be wound on opposing outer legs 204, 208.
- the terminals of first winding 212 is connected in series with the power line.
- the terminals of second winding 214 is connected in series with the return line.
- First outer leg 204 is spaced from l-bar 210 by first outer leg gap 216.
- Center leg 208 is spaced from l-bar 210 by center leg gap 218.
- Second outer leg 206 is spaced from l-bar 210 by second outer leg gap 220.
- Core legs 204, 206, 208 have end surfaces 222, 224, 226 (respectively).
- Flux lines 300, 302, 304 and 306 illustrate the magnetic path and operation of magnetic 200.
- Flux line 300 shows the flux for differential inductor 104.
- Flux line 300 goes through first outer leg 204, a section of upper portion 201 , center leg 208 and a section of I-core 210.
- winding 212 in association with E-core 202 and I-core 210 acts as differential inductor 104.
- Flux lines 304, 306 go through first outer leg 204, upper portion 201 , second outer leg 206 and I-core 210. Flux lines 304, 306 are in opposite direction. Flux lines 304, 306 unite windings 212, 214. Thus, windings 212, 214 in association with E-core 202 and I-core 210 form common mode inductors 108, 110, respectively.
- Flux line 302 illustrates the flux for differential inductor 106.
- Flux line 302 goes through second outer leg 206, a section of upper portion 201 , center leg 208 and a section of I-core 210.
- winding 214 in association with E-core 202 and I-core 210 acts as differential inductor 106.
- the magnetic path for the differential inductors 104, 106 and common mode inductors 108, 110 are closed. Adjustment of gaps 216, 218, and 220 along with altering the number of turns of windings 212, 214 results in an ability to independently adjust the inductances of inductors 104, 106, 108, 110. As is well known:
- N is the number of turns of winding 212
- Ig is the sum of the distance of outer leg gap 216 and center leg gap 218.
- N is the number of turns of winding 214
- Ig is the sum of the distance of outer leg gap 220 and center leg gap 218.
- the inductance of common mode inductor 108 would be found by using the number of turns of winding 212 as N and the sum of distance of outer leg gap 220 and outer leg gap 216.
- the inductance of common mode inductor 110 would be found by using the number of turns of winding 214 as N and the sum of distance of outer leg gap 220 and outer leg gap 216.
- the inductance of inductors 104, 106, 108, 110 can be changed.
- the inductance of differential inductors 104, 106 may be established independent of the inductance of common mode inductors 108, 110.
- gaps 216, 220 are zero, then the inductance of common mode inductor 108, 110 is large, while the inductance of differential inductor 104, 106 is small. If gaps 216, 220 are not zero, but gap 218 is zero, then the inductance of common mode inductors 108, 110 is small while the inductance of differential inductors 104, 106 is large.
- the windings are positioned on the I-core, it is possible to wind them on a single bobbin or directly on the I- core in one operation, reducing the difficulty in manufacturing the magnetic.
- the differential inductor has a closed magnetic path, the number of turns of the windings to achieve a desired inductance are decreased. The result is that larger inductances are possible so that the filtering function is much improved.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Nanotechnology (AREA)
- Power Engineering (AREA)
- Filters And Equalizers (AREA)
- Coils Or Transformers For Communication (AREA)
- Semiconductor Memories (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR9305704A BR9305704A (en) | 1992-10-30 | 1993-10-12 | Electromagnetic device for emi / rfi filter |
KR1019940702267A KR940704083A (en) | 1992-10-30 | 1993-10-12 | Integrated EMI / RFI Filter Magnets (INTEGRATED EMI / RFI FILTER MAGNETICS) |
EP93923365A EP0614583A4 (en) | 1992-10-30 | 1993-10-12 | Integrated emi/rfi filter magnetics. |
KR1019940702267A KR0139032B1 (en) | 1992-10-30 | 1993-10-12 | Integrated emi/rfi filter magnetics |
JP6511090A JPH07504556A (en) | 1992-10-30 | 1993-10-12 | Integrated EMI/RFI filter magnetic device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/968,759 US5313176A (en) | 1992-10-30 | 1992-10-30 | Integrated common mode and differential mode inductor device |
US07/968,759 | 1992-10-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994010749A1 true WO1994010749A1 (en) | 1994-05-11 |
Family
ID=25514733
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1993/009722 WO1994010749A1 (en) | 1992-10-30 | 1993-10-12 | Integrated emi/rfi filter magnetics |
Country Status (9)
Country | Link |
---|---|
US (2) | US5313176A (en) |
EP (1) | EP0614583A4 (en) |
JP (1) | JPH07504556A (en) |
KR (2) | KR0139032B1 (en) |
CN (1) | CN1036957C (en) |
BR (1) | BR9305704A (en) |
CA (1) | CA2125988C (en) |
MX (1) | MX9306694A (en) |
WO (1) | WO1994010749A1 (en) |
Cited By (2)
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US7839251B2 (en) | 2006-10-20 | 2010-11-23 | Vacon Oyj | Filtering choke arrangement for a frequency converter |
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-
1992
- 1992-10-30 US US07/968,759 patent/US5313176A/en not_active Expired - Lifetime
-
1993
- 1993-10-12 CA CA002125988A patent/CA2125988C/en not_active Expired - Lifetime
- 1993-10-12 KR KR1019940702267A patent/KR0139032B1/en active
- 1993-10-12 WO PCT/US1993/009722 patent/WO1994010749A1/en not_active Application Discontinuation
- 1993-10-12 EP EP93923365A patent/EP0614583A4/en not_active Ceased
- 1993-10-12 KR KR1019940702267A patent/KR940704083A/en not_active IP Right Cessation
- 1993-10-12 JP JP6511090A patent/JPH07504556A/en active Pending
- 1993-10-12 BR BR9305704A patent/BR9305704A/en not_active IP Right Cessation
- 1993-10-27 MX MX9306694A patent/MX9306694A/en active IP Right Grant
- 1993-10-29 CN CN93119652A patent/CN1036957C/en not_active Expired - Fee Related
-
1995
- 1995-06-07 US US08/487,128 patent/US5673220A/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3631534A (en) * | 1969-09-05 | 1971-12-28 | Matsushita Electric Ind Co Ltd | Variable inductance device |
JPS5864813A (en) * | 1981-10-15 | 1983-04-18 | Mereka Denshi Kogyo:Kk | Choke core for noise suppression filter |
JPS5881321A (en) * | 1981-11-10 | 1983-05-16 | Nippon Ferrite Ltd | Noise filter |
US5083101A (en) * | 1990-01-03 | 1992-01-21 | Integrated Power Components | Integrated electromagnetic interference filter |
US5119059A (en) * | 1990-09-04 | 1992-06-02 | International Business Machines Corporation | Combined differential and common mode choke for a power supply |
US5155676A (en) * | 1991-11-01 | 1992-10-13 | International Business Machines Corporation | Gapped/ungapped magnetic core |
Non-Patent Citations (1)
Title |
---|
See also references of EP0614583A4 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2109887A1 (en) * | 1995-12-12 | 1998-01-16 | Telefonica Nacional Espana Co | Data transmission protection circuit. |
US7839251B2 (en) | 2006-10-20 | 2010-11-23 | Vacon Oyj | Filtering choke arrangement for a frequency converter |
Also Published As
Publication number | Publication date |
---|---|
US5313176A (en) | 1994-05-17 |
EP0614583A1 (en) | 1994-09-14 |
KR940704083A (en) | 1994-12-12 |
KR0139032B1 (en) | 1998-06-15 |
BR9305704A (en) | 1996-12-31 |
MX9306694A (en) | 1994-06-30 |
EP0614583A4 (en) | 1997-11-26 |
US5673220A (en) | 1997-09-30 |
JPH07504556A (en) | 1995-05-18 |
CN1036957C (en) | 1998-01-07 |
CA2125988C (en) | 1997-07-22 |
CN1088353A (en) | 1994-06-22 |
CA2125988A1 (en) | 1994-05-11 |
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